Structural Definition and 215 Threads

Homework Statement The simply supported timber foot bridge shown in figure 5 spans 7 metres and, as shown, is carried by two Engineering grade Douglas Fir beams. The uniformly distributed load due to the self weight of the foot bridge and beams is 96 kg/m. The bridge is required to carry a...

See the pdf here: www.ellipticinc.com/table.pdf Will this table must be able to hold a 1500 lb axle? Just help me a bit and get me started. I have no idea where to begin.

Hey all, First off, I'd like to mention that I am completely unfamiliar with this ANSYS and have been fighting with this program for last 2 and half weeks. Any feedback and help is greatly appreciated! Please refer to the photos attached for referral. My project currently involves analyzing...

structural question please HELP! Hi all, new to this physics forum business. I am wondering if anyone can tell me how to find reaction forces in a structure where there is more than two supports. I am familiar with the conventional method of taking the moment about a point to find one...

While programming to find the largest prime factor for a composite number i came across a problem that if the number taken as input exceeds a certain limit, the loop time turns out to be a very long one and some times even resembling the time taken by an infinite loop.The method used for finding...

Structural Analysis-Writing Finite Element Code, Dear all, I have written a code ( in fact it is a software) for 3D finite element structural analysis. While developing the code I found that assembling global stiffness matrix is quite complicated. The complication is even more when we...

I have 2 years left in my Civil BS. I plan to do my emphasis in structural engineering. I am currently enrolled in my schools co-op program and have completed the first of my 3 terms. The office I am working in does environmental work. I am learning allot about project management, communication...

hi community, In general I would like to know the what's the general way of solving the moderate or large-scale eigenvalue or algorithms in structural dynmics. The simple motion equation is as follow. M*d2X(t)/dt2+C*dX(t)/dt+K*X(t) = F(t). The bolded expressions are known before the...

What is the difference between civil and Structural engineering? Some employeers ask for civil eng, but other only request Structural Engineers? I've been told that Civil engineers deal with soil mechanics, geotechnia, surveying and the set up for bridges, roads, etc. But arent they fully...

Structural Analysis-"small deformation" Hi all, Assume a cantilever beam fixed to a wall. We let the beam bend under its own weight. In practice the bending could be significant and as the bar bends, the distance between the tip of the bar and the wall decreases. Now my question are...

Hi all, I need to do a dynamic structural analysis using finite element method and I have a question about the mass matrix. Question: I have the force per nodes and I need to calculate the displacement of each node at a given time. For this purpose, it seems that I need to distribute the...

Hello everyone Just a quick question, hopefully someone could shed some light upon what I'm doing wrong here? I'm using ANSYS Workbench to apply a force to what is effectively a cantilever beam, fixed at one end, with a load applied at the other. To be more specific it is a spring strut of...

Consider the set S defined recursively as follows: • 3 ∈ S, • if x,y ∈ S,then x−y∈S, • if x∈S, then 2x ∈ S, • S contains no other element. Use Structural Induction to write a detailed, carefully structured proof that ∀ x ∈ S, ∃ n ∈ Z, x = 3n. What I've got is since 3 is in the set...

Consider the set T defined recursively as follows: • 2∈T, • if x∈T and x>1,then x/2 ∈T, • if x∈T and x>1,then x^2 ∈T, • T contains no other element. Use Structural Induction to write a detailed, carefully structured proof that ∀ x ∈ T, ∃ n ∈ N, x = 2n. I'm not sure how to...

Hey All, I am familiar with some of the practices of bolted connections between steel plates, or steel beams etc. I am currently facing a design problem at work dealing with a composite metal panel being screwed to a hallow PVC beam. The PVC beam is screwed into a hallow aluminum beam...

I just don't get it... still... I don't get it at all... it makes no sense to me... Where can I learn how to read these ? does anyone have any insight as to a guide how to read these or can you explain ? I don't get how structural formula is read...

Homework Statement Several beams of 533 x 210 x 92 kg/m UB section in grade 5275 steel are used to support a composite floor slab. Each beam is simply supported with an effective span of L=6.50 m. (a) During construction, before the floor slab is cast, a temporary concentrated load P kN...

I have a problem in understanding the very basic concept of Structural Analysis. Ironically, I can do the calculations swiftly! But when it comes to theories, I haven't got a clue. So, what is transverse stress, poisson ratio and all that? I know that many people would ask me to go and Google it...

Can you suggest a good book for Structural Analysis that can assist me in my self-study? Thanks a lot.

Hi! I'm looking for information on how one would size a wide-flange beam knowing the live/dead loads and the span required i can't seem to find any calculations for this sort of thing! beam is not composite with floor

ANYS Static Structural, How to simulate 'ground"? Hello all, first post. I'm having trouble simulating a fixed support in only ONE direction. For example, imagine a gigantic frame laid on the ground and you wanted to see the forces deflect from pulling up on one corner, (the ground...

Structural Engineering OR BSc physics&maths!?? i am currently a first year student in BSc Maths and Physics at the university of malta. I've alwyas loved maths and physics, and always have done really well in them. However my main problem is job opportunities i can have BESIDES teaching. can...

20 How many structural and cis-trans isomers are there for dichloropropene, C3H4Cl2. I could find a total of 4, with 2 structural and 2 cis trans. But the answer sheet says 7! can someone tell me all the isomers it can form?

1. demonstrate with a series of sketches that the truss is simple. Find the force in member BE 2. the blurry dimensions: lower lengths left to right: 2 ft, 1 ft, 1ft, 2ft vertical lengths: bottom to top: 2 ft, 1.5 ft, 1.5 ft top length both 3 ft load is 300 lb/ft 3. started by simple inspection...

Hey, I am currently a sophomore Civil Engineering student, however I'm not sure whether I should be studying civil or mechanical (based off what I want to get into). Basically, I want to specialize at some point in the structural aspect, however, I know each field branches off into this...

http://www.flickr.com/photos/53948823@N08/6193375731/ I need to solve this problem but with member 2 as L+e instead of L, and omit the load.. Since I only see one degree of freedom, i don't know how to set up the matrix to solve for the 3 forces. I have K11 = EA/L + (EA/(L+e))cos2(30) +...

Homework Statement A mild steel beam has a solid square cross section of 100mm and is simply supported by two supports 3m apart. calculate the dead load that can be safely supported when applied to the middle of the beam? Homework Equations The Attempt at a Solution given data...

Homework Statement The Attempt at a Solution for part 1: i figured that this structure is not in static equilibrium. once load "P" is applied, the roller at "D" will function as a fulcrum and ABC will lift (make an angle with the horizontal). is that assumption correct...

Im a junior majoring in civil engineering, and I am considering going to grad school to get a MS in structural engineering. i see that my school requires 36 credit hours for a MS in structural, which is about 12 classes. assuming that i took 2 classes over the summer, could i finish a MS in 2...

C3H6Br2 There are 4 structural isomers possible to draw... which I'd like to do :) The carbon skeleton isn't of much importance here, as we only have three carbon atoms. The two halides, however, are a pain, I've found. The linear sigma bonds may rotate around its axis, meaning that...

to figure out the Ay and Ma reactions, i tried to find the effect of the 9kn/m force. i did this by integrating: integral from 0 to 8: 9x i found this to be 288kn for the moment caused by the 9kn/m force: integral from 0 to 8: 9(x^2) i found this to be 1,535kn*m clockwise i then added this...

I am and have been trying to do a specific simulation for the last several weeks. It seems like I take one step forward two steps back. See below: See the attached files. I'm on Ansys Workbench 13. [PLAIN]www.plastics-consulting.com/rod.stp[/URL]...

There are quite a few canalised streams in my area and I was watching one riparian owner's contractor rebuilding his stream retaining walls. The top 2 metres of these walls were being constructed in 225 (9") dense concrete blockwork, three leaves thick making a total wall thickness of 675...

Is it valid to express KOH in this way (see attached image)? I wasn't sure if structural formulae are applicable to ions. The single bond to me denotes a covalent bond, which isn't applicable to the ionic compound KOH, is it?

Homework Statement A 200 kg walkway is supported by the structure shown in attachment. The walkway is 5m long and the vertical support is 1.5m long. a. What angle are the diagonal supports from horizontal? b. What is the compression in the vertical member? c. What is the tension in the...

can anyone please solve the following quastions on the attached PDF files number 3 and 6?

I have a problem trying to find the centroid. I have a plate that is 8in wide and .5 in thick. Then 2- C beams (C8x11.5) placed at each end of the 8in beam with the tips facing each other. They do not go beyond the 8 inches. So it's like a U as an example with the tips facing each other. I...

How do you explain the structural benefits of a hyperbolic paraboloid roof? I think the 2 catenaries help distribute the weight better, but not I'm not sure if there are additional properties for this design. Thanks for your help...

Homework Statement Let S be subset of set of ordered pairs of integers defined recursively by: i) (0,0)\in S ii) If (a,b) \in S, then (a, b + 1) \in S, (a+1, b + 1) \in S,(a+2, b + 1) \in S a) List the elements produced by 4 applications of these steps b) using strong induction on the...

Is it enough/correct to say "the atoms are aligned" in a ferromagnet, or must you specify that "the electrons (or their spin) are aligned"?

Homework Statement Draw the skeletal formula for all of the structural isomers of C5H10 Homework Equations The Attempt at a Solution I attached a picture of what I got so far. Are they right and am I missing any. Thanks a lot. I know that there should be another line coming from the corner...

1. Homework Statement Homework Equations I am totally confused about this question because of the Cantilever beam. I am usally ok with these questions but the addition of the Cantilever beam has thrown me off. The Attempt at a Solution Only been attemped without Cantilever beam.

Hello, I am assisting my professor by investigating the usefulness of Simscape in structural engineering. I have just recently obtained a copy of Matlab, and I am totally unfamiliar with the entire program as a whole. I was wondering if anyone knew of any good reading materials or tutorials...

I've been trying to solve a structural mechanics problem from the book Mechanics of Materials, but the results I acquired weren't very satisfying. Here it is Homework Statement [PLAIN]http://img42.imageshack.us/img42/4375/p17n.jpg Homework Equations Average Stress: \sigma= F/A...

Hi there, I've got an assignment due today and as usual have left finishing it off until the last minute. I've completed most of it but I thought I'd try and get an opinion on something. Homework Statement Basically our teacher has asked us for a very simple steel frame (beam, column...

Homework Statement The difference between structural unit and repeating unit Homework Equations The Attempt at a Solution http://en.wikipedia.org/wiki/Structural_unit wikipedia gives an example with polyethylene terephthalate but I can't figure it out based on the slight...

Homework Statement Below is a truss system, use the point method to solve for all forces within the trusses. http://tinypic.com/view.php?pic=25i2dma&s=3 my question, If I take pin F then I have 4 trusses, 2 of them known(FE, FD) and 2 unknowns(GF, CF). exactly what should I do with truss...

Hello every one I hope I'm in the right place to ask this question :) well , have you heared about Dr. Emoto's ? http://www.is-masaru-emoto-for-real.com/" my friend were in US last year , and she was joining some one who provides her by these info. when she told me , it was my 1st...

For a summer job I am employed to look into the use of composite paneling in place of sheet aluminum with stiffeners. I am suppose to find the required thickness of composite wall paneling in order to make a structure such as the one attached. Obviously it will depending on the material...

I'm trying to run a simple regression for a data set (n=165). I've determined via a Chow Test that there exists a structural break somewhere; the same least squares estimate cannot be accurately used to represent the entire range of values the explanatory variable takes on. I've found two very...